They're not a wholesale only company, but EH Teasley is who we use if we can't get it on our printers. ehteasley.com
Super nice people.
(Funny story, we actually took in a new customer a few years ago and had some fabric pole banners to produce for them. We use EH Teasley for our sewing, so we printed the fabric and sent it down there to sew and it turned out it was originally their customer. They were super cool about it. They basically said "better that we get the sewing than nothing at all" and we've done the job a few more times with them.)